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The Bill Hartman Podcast for The 16% - Season 13 - Number 10 Podcast
Bill:
Bill Hartman 0:00–0:20
Good morning. Happy Monday. I have neural coffee in hand and Come on Bill. Give us one chance one shot Good morning happy Monday.
SPEAKER_03 0:20–1:46
I have neural coffee in hand and It is perfect All right, well, obviously that wasn't me. That was Matt from Australia who is here for the Intensive 18. We just wrapped that up over the weekend. Arguably one of the most intensive intensive. We had some returning people, so it got really, really deep, really, really quickly, but it was a great time. Thank you all for being here. I truly appreciate you. Intensive 19, obviously applications are closed. We're going to be picking those here within the next couple of days. So if you did apply, please be looking in your emails. I think I put the deadline at August 4th in letting you guys know about that. Digging into today's Q&A. This is with Manuel. It's going to be a great foundational question for a lot of people because we covered a lot of ground in a relatively short period of time, basically talking about the shape change that takes place in the pelvis during the squat and the directionality of the internal and external rotations. And so if you're having trouble with understanding how we actually change shape, As you're passing through the spot, there's gonna be a great call for you. Apologies for not getting the podcast up over the weekend. It was a really long, hard intensive, but in such a good way. But energy was low, so we'll probably get that up a little bit later today for all of you there. Appreciate you all. Everybody have an outstanding Monday, and I will see you tomorrow.
pelvis mechanicssquat biomechanicsinternal/external rotationpelvic shape changehip joint movement
Bill Hartman 1:51–2:11
Hey, Bill, I wanted to go back to the squats and to kind of review some of the mechanics that are going on between the three phases. So when we start, so we initiate, so we're in that late representation, so we're moving the ilium on the sacrum. Right. And so then as you descend, the sacrum starts to mutate. Correct. And then the ilium starts to IR as well as you get closer to the point. Then as you go into maximal depth, the sacrum is moving on the ilium and you hit depth.
squat mechanicspelvic movementilium rotationsacral movementsquat phases
SPEAKER_03 2:12–2:12
Yes.
Bill Hartman 2:13–2:33
Right. And so then as you descend, the sacrum starts to move. Correct. And then the ilium starts to internal rotate as well as you get closer to the point. Then as you go into maximal depth, the sacrum is moving on the ilium and you hit depth.
pelvic mechanicssquat techniquesacral movementiliac movement
SPEAKER_03 2:35–2:38
You said depth. I'm sorry.
squat mechanicssacrum movementilium movement
Bill Hartman 2:39–2:39
Yes.
SPEAKER_03 2:39–2:39
Yes.
Bill Hartman 2:40–2:57
Okay, so as you move in that space, are the connective tissues starting from a concentric, overcoming, and then concentrically yield, and then eccentrically yield?
connective tissue mechanicsconcentric contractioneccentric contractionbiomechanics
SPEAKER_03 3:02–3:12
Depending on where you're looking. Yes. I mean, if you looked at the outlet position, that would be a really good representation of the outlet position.
connective tissueoutlet positionbiomechanical representation
Bill Hartman 3:13–3:29
And then I guess. Is that what we're mainly concerned about when we talk about the connective tissue in that case? Or is that happening throughout the rest of the connective tissue, like at the knee or at the ankle?
connective tissueknee mechanicsankle mechanics
SPEAKER_03 3:30–5:26
Okay, so anywhere that you see the expanded representation. Keep in mind that this is going to be a load that's going to be a magnitude dependent representation. If we were looking at a knee from a rotational perspective in 2D representation, as you bend the knee, you have a compression strategy on the posterior aspect and an expanded representation on the anterior aspect. With tibial rotation, if you start from the loaded representation and consider the center of gravity, you're not in a yielded state until you start to descend. The knee goes through its loaded representation, expanding anteriorly. As you sit and relax into the bottom of a squat, you can feel the expansion of the connective tissue behavior at the knee. Some lifters might sort of bottom out in that position, where the contact at the knee is radically different when passively expanded. You lose some of the congruence of the knee joint as they descend. That would be a sensation where you understand the expansion concept.
connective tissue behaviorknee biomechanicsjoint loadingtibial rotationsquat mechanics
Bill Hartman 5:26–6:09
So then, yeah, so I did kind of want to work my way down as to how the femur and then the tibia are rotating throughout that excursion. So when you started to top your femur is ER because your hip is open, you have your, uh, that's what's getting you that legs out knees out foot out representation. And then as you go down, you're maintaining that, but you're superimposing the IR at the femur through the sticking point. And then as you hit depth, do you see a re-ER. ER of the femur?
femur rotationtibia rotationhip mechanicsknee excursioninternal/external rotation
SPEAKER_03 6:09–6:21
Okay, so you've got a shape change. And again, keep in mind this is all relative to magnitude because the magnitude of load is going to take away the ER. You're going to get a re-ER of the—again, there are relative motions that are taking place, but if you look at it from the perspective of a re-ER. So think about the counter-neutrated representation of the sacrum, okay? That's an expanded, expanded sacrum. So look at the sacrum like a parachute. It's got to expand into that counter-neutrated position.
joint rotationconnective tissue mechanicssacral motion
Bill Hartman 6:22–6:22
Yeah.
SPEAKER_03 6:23–6:53
Yeah, you're gonna get a re-ER of the femur, and again, there's relative motions that are taking place, but if you look at it from the perspective of a re-ER. So think about the counter-neutated representation of the sacrum. That's an expanded sacrum. So look at the sacrum like a parachute. It's got to expand into that counter-neutated position. Follow me so far. Okay. The lumbar spine is actually attached to the base of the sacrum. It's got to follow. So that's going, so the lumbar spine in the deepest of deep squats would have to follow the sacrum. So if the sacrum is moving towards a counter-neutated representation, expanded ER representation, the spine is going to follow. And so that would mean that the iterative representations are going to follow that too, which means that I will have a re-ER at the bottom.
squat mechanicssacral movementfemoral rotationlumbar spine kinematicscounter-neutated position
Bill Hartman 6:54–6:55
Yes, yeah.
sacrum biomechanicssquat mechanicslumbar spine movement
SPEAKER_03 6:55–7:40
Okay. The lumbar spine is actually attached to the base of the sacrum. It has to follow. So in the deepest of deep squats, the lumbar spine has to follow the sacrum. If the sacrum is moving towards a counter-neutated representation, which is an expanded external rotation representation, the spine is going to follow. And so that would mean the intervertebral segments are going to follow that too, which means I will have an external rotation at the bottom. Think about this for a moment. Take the heaviest weight you've ever squatted. Was that your deepest squat ever?
squat mechanicssacral movementcounter-neutationlumbar spine mechanicsexternal rotation
Bill Hartman 7:40–7:46
No, but no, it was okay.
SPEAKER_03 7:47–7:53
And the reason being is because if you went into your deepest squat ever with a PR load, you're never getting out of it because you would dampen so much at the bottom because the connective tissue behaviors would be yielded. The yield would just expand throughout your system, and you would not be able to recapture the energy to recoil yourself back up. So you limit the ER exposure to keep the connective tissues stiff enough so that they deform and store more energy and release. But it's a re-ER-ing at the bottom.
squat biomechanicsconnective tissue behaviorenergy transferexternal rotation (ER)
Bill Hartman 7:53–7:53
No.
SPEAKER_03 7:54–8:20
Because you would dampen so much at the bottom because the connective tissue behaviors would yield. The yield would just expand throughout your system, and you would not be able to recapture the energy to recoil yourself back up. So you limit the ER exposure to keep the connective tissues stiff enough so that they deform and store more energy and release. But it's a re-ER-ing at the bottom.
connective tissue mechanicsenergy storage and releasejoint range of motionbiomechanics
Bill Hartman 8:23–8:38
So the way I was starting to think of it was with the counterneutation, you're expanding the anterior outlet. You're reducing, I guess, anterior compression. And so that would re-ER the femurs.
counterneutationanterior outletfemoral external rotation
SPEAKER_08 8:39–8:39
Yeah.
Bill Hartman 8:39–8:40
OK.
SPEAKER_08 8:41–8:41
Yeah.
Bill Hartman 8:41–8:55
And then so then the last piece that I had was the tibia. So I know we talked about the tibia moving back and then at the deepest part. Yes. So hang on. Can we define back?
tibia movementjoint mechanicskinematics
SPEAKER_03 8:56–8:57
To make life simple.
Bill Hartman 8:58–9:05
I'm trying to move away from 2D because it's confusing. It would IR.
biomechanicsjoint mechanicstibia movement
SPEAKER_03 9:08–9:56
To a degree until you hit that point at the bottom where it has to yield, then it's going to externally rotate just like you would if you were stepping forward. So the backward movement of the tibia that you would see, like if you're standing to someone's side and you see the tibia go forward as they squat and then it drops back because it's following the sacrum, right? So the tibia and the sacrum are moving back together. The reason that it's moving back from that two-dimensional view is because it's externally rotating again. It's doing the same thing that the sacrum is doing. The sacrum is expanding back into external rotation. It's the expanded representation of the sacrum. The tibia is going to move into its external rotation representation. It's an early external rotation representation.
tibia movementsacrum movementexternal rotationsquat mechanicsbiomechanics